I think these books always, always underestminate babies
I have NEVER managed to work out how to mould my kids to my will, NEVER.
It would have been utterly impossible to follow a routine with either of my first two, because they screamed they place down if denied milk for 3 seconds or put anywhere aside from the sling or our arms.
dd2 is much "easier" and will actually fall asleep by herself. She will, if put in her bouncy chair, sometimes wail for a minute then fall asleep (I have 3 kids under 4.5, sometimes one of them has to scream ).
If she was my only one, jesus I'd be smug, I'd be thinking "wow, my easygoing parenting has produced a laid back child"
Sadly I learnt my lesson with ds/dd. ds never tantrumed. He never went through the "nonono" phase-he said "yes" and smiled, fgs. Naturally I assumed this was my fabulous parenting. Then dd started tantruming at about 10 months and never really stopped...